Boring machine



FIG. 1 is a front perspective view of the boring machine embodying our design;

FIG. 2 is a rear perspective view of FIG. 1;

FIG. 3 is a front elevational view of FIG. 1;

FIG. 4 is a rear elevational view of FIG. 1;

FIG. 5 is a left side elevational view of FIG. 1;

FIG. 6 is a right side elevational view of FIG. 1; and,

FIG. 7 is a top plan view of FIG. 1.

The broken lines in the drawing illustrate portions of the boring machine that form no part of the claimed design. 

CLAIM We claim the ornamental design for the boring machine, as shown and described. 